subbituminózus

Subbituminous coal is a rank of coal that falls between lignite and bituminous coal. It is formed from peat under moderate pressure and temperature. Subbituminous coal has a higher heating value than lignite but lower than bituminous coal. Its moisture content is typically lower than lignite, and its volatile matter content is higher than bituminous coal. The carbon content of subbituminous coal generally ranges from 76% to 86% on a dry, ash-free basis.

This type of coal is commonly used as fuel for electricity generation in power plants. It is also used in industrial processes. Subbituminous coal deposits are found in various parts of the world, including the United States, Canada, Australia, and Russia. The extraction of subbituminous coal is typically done through surface mining methods, although underground mining can also be employed depending on the depth and geological conditions of the deposit. Its environmental impact, like other coal types, includes emissions of greenhouse gases and other pollutants during combustion.